CN116177670A - Recycling water treatment method and water treatment system for denitrification and dephosphorization - Google Patents
Recycling water treatment method and water treatment system for denitrification and dephosphorization Download PDFInfo
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- CN116177670A CN116177670A CN202211689051.0A CN202211689051A CN116177670A CN 116177670 A CN116177670 A CN 116177670A CN 202211689051 A CN202211689051 A CN 202211689051A CN 116177670 A CN116177670 A CN 116177670A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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Abstract
The invention relates to a denitrification and dephosphorization recycling water treatment method and a water treatment system, wherein the water treatment method comprises the following steps: the initial waste liquid is treated by nitric acid-phosphate ion exchange resin, so that regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration are obtained, and the dischargeable water is directly discharged; reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas, and absorbing the nitrogen oxide gas by adopting alkali liquor to obtain liquid nitrogen fertilizer; concentrating a liquid phase obtained by reducing the regenerated waste liquid, purifying phosphate in the concentrated liquid, and obtaining residual liquid and acid condensate; mixing the residual liquid, the acid condensate and the fresh acid liquid to obtain a resin regeneration liquid; and regenerating the nitric acid-phosphate ion exchange resin by using the resin regeneration liquid. The water treatment method can convert phosphate radical and nitrate radical in the wastewater into valuable products, and can realize zero emission of pollution.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a denitrification and dephosphorization recycling water treatment method and a water treatment system.
Background
When the sewage gathered in natural water area exceeds the self-cleaning capacity, the water quality can change, and the environmental problems of eutrophication, organic pollution and the like appear, which seriously affect the effective utilization of water resources. Eutrophication of water quality is generally reflected in unbalanced species distribution of the water ecological system caused by excessive content of nutrient salts such as nitrogen, phosphorus and the like in water, and single species overgrow to destroy the flow of substances and energy of the water ecological system, so that the whole water ecological system gradually goes to death.
The existing water treatment technology comprises physical treatment, chemical treatment and biological treatment, wherein the physical treatment mainly depends on adding Polymeric Alumina (PAC) to lake water to remove phosphorus, and a large amount of chemical precipitation is generated; the chemical treatment mainly depends on adding sodium hypochlorite and the like to reduce the total nitrogen content in a mode of reducing ammonia nitrogen, so that the ecological effect of the water body is influenced; the biological treatment depends on microorganism strains to reduce the total nitrogen and total phosphorus content of the lake water, and needs to be added for a long time, and the cost is high.
Disclosure of Invention
Aiming at the problems of the existing water treatment technology, the invention provides a denitrification and dephosphorization recycling water treatment method and a water treatment system.
The technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a method for treating water for denitrification and dephosphorization, comprising:
the initial waste liquid is treated by nitric acid-phosphate ion exchange resin, so that regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration are obtained, and the dischargeable water is directly discharged;
reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas, and absorbing the nitrogen oxide gas by adopting alkali liquor to obtain liquid nitrogen fertilizer;
concentrating a liquid phase obtained by reducing the regenerated waste liquid, purifying phosphate in the concentrated liquid, and obtaining residual liquid and acid condensate;
mixing the residual liquid, the acid condensate and the fresh acid liquid to obtain a resin regeneration liquid;
and regenerating the nitric acid-phosphate ion exchange resin by using the resin regeneration liquid.
On the basis of the technical scheme, the method for reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas comprises the following steps: nitrate in the regenerated waste liquid is converted into nitric oxide through the iron-copper primary cell, and the iron simple substance is converted into iron ions to enter a liquid phase.
On the basis of the technical scheme, the concentration of the liquid phase obtained by reducing the regeneration waste liquid comprises the following steps: and heating, concentrating and crystallizing the liquid phase obtained by reducing the regenerated waste liquid by a two-stage MVP crystallizer to obtain ferrous phosphate and ferrous chloride solid products respectively.
On the basis of the technical scheme, the nitrate concentration in the liquid phase obtained by reducing the regenerated waste liquid is less than or equal to 100mg/L.
On the basis of the technical scheme, the method for absorbing the nitrogen oxide gas by adopting the alkali liquor comprises the following steps: providing a gas absorption tower with top spraying alkali liquor; introducing nitrogen oxide gas from the bottom of the gas absorption tower to obtain nitrate solution.
On the basis of the technical scheme, the method also comprises the following steps of: filtering to remove particles with the particle size larger than 0.1mm in the initial waste liquid.
In a second aspect, the present invention provides a denitrification and dephosphorization recycling water treatment system, comprising:
an anion resin tank, wherein nitric acid-phosphate ion exchange resin is arranged in the anion resin tank and is used for separating the initial waste liquid into regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration;
the waste liquid reduction reaction device is internally provided with an iron-copper primary battery which is used for reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas;
the gas-phase recycling equipment is internally provided with alkali liquor, and the alkali liquor is used for absorbing nitrogen oxide gas to obtain a nitrogen-containing product;
the concentration and purification device is used for concentrating and crystallizing the water body treated by the waste liquid reduction reaction device to obtain a ferrous phosphate solid product, a residual liquid and an acid condensate;
and the resin regeneration liquid storage tank is used for mixing the residual liquid, the acid condensate and the fresh acid liquid to form resin regeneration liquid, and after the operation of the nitric acid-phosphate ion exchange resin is saturated, the resin regeneration liquid is discharged from the resin regeneration liquid storage tank to regenerate the nitric acid-phosphate ion exchange resin.
On the basis of the technical scheme, the concentration and purification device comprises a two-stage MVP crystallizer which is sequentially used for obtaining ferrous phosphate solids and ferrous chloride solids.
On the basis of the technical scheme, the denitrification and dephosphorization recycling water treatment system further comprises a filtering unit, wherein the filtering unit is used for filtering particles with the particle size larger than 0.1mm in the initial waste liquid.
On the basis of the technical scheme, the gas-phase recycling equipment is a gas absorption tower.
The technical scheme of the invention has the following advantages and beneficial effects:
1. the denitrification and dephosphorization recycling water treatment method provided by the invention recycles phosphate and nitrate pollutants in the water body, so that the pollutants which originally need to be processed at high cost are converted into resources capable of obtaining profits, after the nitrate is reduced into nitrogen oxide gas, the nitrogen oxide gas is refined or prepared into other nitrogen-containing high-added-value products such as liquid nitrogen fertilizer, and the phosphate is concentrated and then is converted into ferrous phosphate products.
2. The denitrification and dephosphorization recycling water treatment method provided by the invention mixes the residual liquid, the acid condensate and the fresh acid liquid and then uses the mixture for regenerating the nitric acid-phosphate ion exchange resin, thereby realizing zero discharge of wastewater.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a denitrification and dephosphorization recycling water treatment system provided by the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in FIG. 1, the denitrification and dephosphorization recycling water treatment system provided by the invention comprises:
the filtering treatment unit is used for filtering and removing particles with the particle size of more than 0.1mm in the initial waste liquid;
the anion resin tank is internally provided with nitric acid-phosphate ion exchange resin, and the selective adsorption sequence of the nitric acid-phosphate ion exchange resin on each anion is as follows: NO (NO) 3 - ≥PO 4 3- ＞＞SO 4 2- ＞CL - The original waste liquid can be separated into regenerated waste liquid with high nitrogen and phosphorus concentration and regenerated waste liquid with low nitrogen and phosphorus concentrationWater can be discharged;
the waste liquid reduction reaction device is internally provided with an iron-copper primary battery which is used for reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas so as to reduce the total nitrogen content in the liquid phase;
the gas-phase recycling equipment is internally provided with alkali liquor, and the alkali liquor is used for absorbing nitrogen oxide gas to obtain a nitrogen-containing product (liquid nitrogen fertilizer);
the concentration and purification device is used for concentrating and crystallizing the water body treated by the waste liquid reduction reaction device to obtain a ferrous phosphate solid product, a ferrous chloride solid product, a residual liquid mainly containing ferric salt, an acid condensate mainly containing hydrochloric acid and a later condensate with less impurities;
and the resin regeneration liquid storage tank is used for mixing the residual liquid, the acid condensate and the fresh acid liquid to form resin regeneration liquid, and after the operation of the nitric acid-phosphate ion exchange resin is saturated, the resin regeneration liquid is discharged from the resin regeneration liquid storage tank to regenerate the nitric acid-phosphate ion exchange resin.
The filtering treatment unit can comprise a filter tank, graded filter materials (quartz sand, anthracite, haydite and the like), a back flushing facility and a filter treatment unit for treating solid suspended matters in a water body to be less than or equal to 10mg/L and removing particles with the particle size of more than 0.1 mm.
The invention provides a denitrification and dephosphorization recycling water treatment method, which comprises the following steps:
treating the initial waste liquid by nitric acid-phosphate ion exchange resin to obtain regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration, wherein the dischargeable water is directly discharged into a lake or river;
reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas, and absorbing the nitrogen oxide gas by adopting alkali liquor to obtain liquid nitrogen fertilizer;
concentrating the liquid phase obtained by reducing the regenerated waste liquid, purifying phosphate in the concentrated liquid, and obtaining residual liquid mainly containing ferric salt, acid condensate mainly containing hydrochloric acid and later condensate with less impurities;
mixing the residual liquid, the acid condensate and the fresh acid liquid to obtain a resin regeneration liquid; the condensate liquid in the later stage can be directly discharged into a lake or a river or discharged after being treated by nitric acid-phosphate ion exchange resin;
and regenerating the nitric acid-phosphate ion exchange resin by using the resin regeneration liquid.
On the basis of the technical scheme, the method for reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas comprises the following steps: nitrate in the regenerated waste liquid is converted into nitric oxide through the iron-copper primary cell, and in the process, elemental iron is converted into ferrous ions to enter water.
On the basis of the technical scheme, most nitrate in the liquid phase after reduction is reduced into nitrogen oxide gas for recovery, only a small amount of nitrate remains in the liquid phase, and preferably, the concentration of nitrate in the liquid phase obtained by reduction of the regenerated waste liquid is less than or equal to 100mg/L.
On the basis of the technical scheme, the method for absorbing the nitrogen oxide gas by adopting the alkali liquor comprises the following steps: providing a gas absorption tower with top spraying alkali liquor; introducing nitrogen oxide gas from the bottom of the gas absorption tower to obtain nitrate solution.
On the basis of the technical scheme, concentrating the liquid phase obtained by reducing the regeneration waste liquid comprises the following steps: and heating, concentrating and crystallizing the liquid phase obtained by reducing the regenerated waste liquid by a two-stage MVP crystallizer to obtain ferrous phosphate and ferrous chloride solid products respectively. The liquid phase generated by the waste liquid reduction reaction device is mainly ferrous salt, and enters a concentration purification device to obtain a product which mainly contains ferrous (mainly ferrous sulfate if the fresh acid liquid is sulfuric acid, and mainly ferrous chloride if the acid liquid is hydrochloric acid) and contains part of ferrous phosphate crystals.
On the basis of the technical scheme, the method also comprises the following steps of: filtering to remove particles with the particle size larger than 0.1mm in the initial waste liquid.
The following describes the technical scheme of the present invention in detail through specific embodiments:
example 1
As shown in fig. 1, the denitrification and dephosphorization recycling water treatment system provided in this embodiment includes:
the filtering treatment unit is used for filtering out solid impurities in the water body;
the anion resin tank is internally provided with nitric acid-phosphate ion exchange resin, and the selective adsorption sequence of the nitric acid-phosphate ion exchange resin on each anion is as follows: NO (NO) 3 - ≥PO 4 3- ＞＞SO 4 2- ＞CL - > other anions;
the waste liquid reduction reaction device is internally provided with an iron-copper primary cell which can reduce nitrate radical in the water body into nitrogen oxide gas so as to reduce the total nitrogen content in the water body;
the gas-phase recycling equipment is a gas absorption tower filled with alkali liquor, and nitrogen oxide gas is absorbed by the alkali liquor to obtain a nitrogen-containing product (liquid nitrogen fertilizer);
the concentration and purification device comprises a two-stage MVP crystallizer, and is used for concentrating and crystallizing the water body treated by the waste liquid reduction reaction device to respectively obtain ferrous phosphate and ferrous chloride solid products;
the resin regenerated liquid storage tank is used for mixing the residual liquid, the acid condensate and the fresh acid liquid to obtain resin regenerated liquid; and temporarily storing the resin regeneration liquid, and after the operation of the nitric acid-phosphate ion exchange resin is saturated, discharging part of the resin regeneration liquid from the resin regeneration liquid storage tank to regenerate the nitric acid-phosphate ion exchange resin.
The denitrification and dephosphorization recycling water treatment method provided by the embodiment comprises the following steps:
(1) Filtering inferior lake and river water bodies with total nitrogen content of 4mg/L and total phosphorus content of 2mg/L according to 10000 t/d;
(2) The filtered water body (total nitrogen content is 4mg/L and total phosphorus content is 2 mg/L) flows through an anion resin tank provided with nitric acid-phosphate ion exchange resin, anions are adsorbed by the nitric acid-phosphate ion exchange resin, and water capable of being discharged with low nitrogen and phosphorus concentration (total nitrogen content is 0.2mg/L, total phosphorus content is 0.01mg/L,1003 t/d) and regeneration waste liquid with high nitrogen and phosphorus concentration (total nitrogen content is 1950mg/L, total phosphorus content is 1045mg/L,20 t/d) are obtained, and the water capable of being discharged meets the requirements of a type of lakes and reservoirs (total nitrogen is less than 1.0mg/L and total phosphorus is less than 0.05 mg/L) and is directly discharged into lakes or rivers;
(3) The regenerated waste liquid generated in the step (2) enters a waste liquid reduction device provided with an iron-copper primary cell (the built-in iron-copper primary cell, the reaction principle is that copper reacts with nitrate to generate nitric oxide, water and ions under an acidic environment, then iron reduces the copper ions into copper simple substance), and the iron-copper primary cell reduces nitrate in the regenerated waste liquid into nitric oxide gas to obtain a liquid phase with reduced nitrogen content (the total nitrogen content is 60mg/L, the total phosphorus content is 1045mg/L, and the total phosphorus content is 20 t/d) and a gas phase;
(4) The gas phase (nitric oxide gas) generated in the step (3) enters gas phase recycling equipment filled with alkali liquor, and the nitric oxide gas is absorbed by the alkali liquor to obtain a nitrogen-containing product (liquid nitrogen fertilizer, nitrogen content is 37.8 kg/d); the liquid phase generated in the step (3) enters a concentration and purification device to obtain a phosphorus-containing product (the main component is ferrous phosphate, the total nitrogen content is 0.2kg/d, the total phosphorus content is 19 kg/d), a residual liquid (the total nitrogen content is 4532mg/L, the total phosphorus content is 4515mg/L,0.2 t/d), an acid condensate (the total nitrogen content is 10mg/L, the total phosphorus content is 10mg/L, the hydrogen chloride content is 11% and 17 t/d) and a later condensate (the total nitrogen content is <5mg/L, the total phosphorus content is <5mg/L and 3 t/d); the phosphorus-containing product and the nitrogen-containing product are collected and then refined or directly sold, the condensate in the later stage is basically clear water, and can be directly discharged into a lake or a river, and the condensate is discharged into the lake or the river after being adsorbed by nitric acid-phosphate ion exchange resin, so that the safety is improved;
(5) And (3) feeding the residual liquid and the acid condensate generated in the step (4) into a resin regeneration liquid storage tank, and adding fresh acid liquid (35% hydrochloric acid, 3 t/d) to obtain resin regeneration liquid (total nitrogen content is 50mg/L, total phosphorus content is 50mg/L, hydrogen chloride content is 14.6%, and 20 t/d).
(6) And (3) after the operation of the nitric acid-phosphate ion exchange resin is saturated, the resin regeneration liquid in the resin regeneration liquid storage tank and the later condensate liquid generated in the step (4) enter an anion resin tank for regenerating the nitric acid-phosphate ion exchange resin.
According to the denitrification and dephosphorization recycling water treatment system and the water treatment method provided in the embodiment 1, water discharged from a lake and reservoir river water body (initial wastewater) to be treated in an emergency way is filtered and enters an anion resin tank, nitrate ion exchange resin is filled in the anion resin tank, water which can be discharged is obtained after the reaction is finished, total nitrogen can be stably smaller than 0.2mg/L, total phosphorus can be stably smaller than 0.01mg/L, both indexes can meet the requirements of a type of lake and reservoir (generally, total nitrogen is smaller than 1.0mg/L, total phosphorus is smaller than 0.05mg/L, and water which can reach the standard of 3 types of water bodies can be discharged), and the water can be directly discharged into a natural river body.
The invention is found in experiments: the resin regeneration liquid prepared by adding 0.5 part by weight of residual liquid and 0.5 part by weight of acid liquid and 9 parts by weight of water can meet the regeneration requirement of nitric acid-phosphate ion exchange resin, and compared with the regeneration liquid prepared by the acid liquid completely, the acid consumption is reduced by more than about 50 percent.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A denitrification and dephosphorization recycling water treatment method is characterized by comprising the following steps:
the initial waste liquid is treated by nitric acid-phosphate ion exchange resin, so that regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration are obtained, and the dischargeable water is directly discharged;
reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas, and absorbing the nitrogen oxide 5 oxide gas by adopting alkali liquor to obtain liquid nitrogen fertilizer;
concentrating a liquid phase obtained by reducing the regenerated waste liquid, purifying phosphate in the concentrated liquid, and obtaining residual liquid and acid condensate;
mixing the residual liquid, the acid condensate and the fresh acid liquid to obtain a resin regeneration liquid;
and regenerating the nitric acid-phosphate ion exchange resin by using the resin regeneration liquid.
2. The denitrification and dephosphorization recycling water treatment method according to claim 1, characterized in that: the reduction of nitrate in the regenerated waste liquid into nitrogen oxide gas comprises the following steps:
nitrate in the regenerated waste liquid is converted into nitric oxide through the iron-copper primary cell, and the iron simple substance is converted into iron ions to enter a liquid phase.
3. The method for recycling water treatment by denitrification and dephosphorization according to claim 2, which is characterized in that the method comprises the following steps: the concentrating of the liquid phase obtained by reducing the regeneration waste liquid comprises the following steps:
and heating, concentrating and crystallizing the liquid phase obtained by reducing the regenerated waste liquid by a two-stage MVP crystallizer to obtain ferrous phosphate and ferrous chloride solid products respectively.
4. The denitrification and dephosphorization recycling water treatment method according to claim 1, characterized in that: the concentration of nitrate radical in the liquid phase obtained by the reduction of the regenerated waste liquid is less than or equal to 100mg/L.
5. The denitrification and dephosphorization recycling water treatment method according to claim 1, characterized in that: the absorption of nitrogen oxide gas by alkali liquor comprises the following steps:
providing a gas absorption tower with top spraying alkali liquor;
introducing nitrogen oxide gas from the bottom of the gas absorption tower to obtain nitrate solution.
6. The denitrification and dephosphorization recycling water treatment method according to claim 1, characterized in that: the method for treating the initial waste liquid by the nitric acid-phosphate ion exchange resin further comprises the following steps: filtering to remove particles with the particle size larger than 0.1mm in the initial waste liquid.
7. A nitrogen and phosphorus removal recycling water treatment system, comprising:
an anion resin tank, wherein nitric acid-phosphate ion exchange resin is arranged in the anion resin tank and is used for separating the initial waste liquid into regenerated waste liquid with high nitrogen and phosphorus concentration and dischargeable water with low nitrogen and phosphorus concentration;
the waste liquid reduction reaction device is internally provided with an iron-copper primary battery which is used for reducing nitrate radical in the regenerated waste liquid into nitrogen oxide gas;
the gas-phase recycling equipment is internally provided with alkali liquor, and the alkali liquor is used for absorbing nitrogen oxide gas to obtain a nitrogen-containing product;
the concentration and purification device is used for concentrating and crystallizing the water body treated by the waste liquid reduction reaction device to obtain a ferrous phosphate solid product, a residual liquid and an acid condensate;
and the resin regeneration liquid storage tank is used for mixing the residual liquid, the acid condensate and the fresh acid liquid to form resin regeneration liquid, and after the operation of the nitric acid-phosphate ion exchange resin is saturated, the resin regeneration liquid is discharged from the resin regeneration liquid storage tank to regenerate the nitric acid-phosphate ion exchange resin.
8. The denitrification and dephosphorization recycling water treatment system according to claim 7, wherein: the concentration and purification device comprises a two-stage MVP crystallizer, and is used for obtaining different ferrous salt solid ferrous phosphate solids and ferrous chloride solids.
9. The denitrification and dephosphorization recycling water treatment system according to claim 7, wherein: the denitrification and dephosphorization recycling water treatment system also comprises a filtering unit, wherein the filtering unit is used for filtering particles with the particle size of more than 0.1mm in the initial waste liquid.
10. The denitrification and dephosphorization recycling water treatment system according to claim 7, wherein: the gas phase recycling equipment is a gas absorption tower.
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